What is the difference between Inconel 625 and Hastelloy C-276?
What is Alloy 625 Tube Made Of?
Alloy 625 Nickel Tube is made of a nickel-chromium-molybdenum alloy with the addition of niobium. High strength and toughness at cryogenic temperatures down to 1800°F (about 854°C). Good oxidation resistance, excellent fatigue strength, and good resistance to many corrosives.
What is the difference between Inconel 625 and Hastelloy C-276?
Overview. Inconel 625 and Hastelloy C-276 are both nickel-chromium-molybdenum based alloys. They both have excellent corrosion resistance and good strength. In comparison, Inconel 625 has a higher chromium content, while Hastelloy C-276 has a higher molybdenum content.
Is Inconel 625 alloy magnetic?
Inconel 625 alloy is a non-magnetic, corrosion-resistant and oxidation-resistant nickel-chromium alloy. The high strength of Inconel 625 alloy comes from its strengthening combination of molybdenum and niobium added to the nickel-chromium matrix.
What size is Inconel 625 pipe?
The Alloy 625 Seamless Tubing comes in sizes ranging from 4mm to 219mm. There are welded, fabricated and LSAW pipes as well. The welded and EFW pipes range from 5mm to 1219.2mm in size. The wall thickness of the Inconel 625 Seamless Pipe ranges from 0.5mm 20mm.
What is the difference between Inconel 625 and Hastelloy C-276?
Chemical Composition
| Element | Alloy 625 Requirements | Alloy C-276 Requirements |
|---|---|---|
| S (Sulfur) | ≤ 0.015% | ≤ 0.030% |
| Si (Silicon) | ≤ 0.50% | ≤ 0.08% |
| C (Carbon) | ≤ 0.10% | ≤ 0.01% |
| Mn (Manganese) | ≤ 0.50% | ≤ 1.00% |
| P (Phosphorus) | ≤ 0.015% | ≤ 0.040% |
| Nb+Ta (Niobium + Tantalum) | 3.15% ~ 4.15% | (Not specified) |
| V (Vanadium) | ≤ 0.35% | (Not specified) |
| W (Tungsten) | 3.0% ~ 4.5% | (Not specified) |
| Fe (Iron) | (Not specified) | 4.0% ~ 7.0% (Note: Also listed as ≤5.0% elsewhere) |
Main Standards
| Product Form | Inconel 625 Standards | Hastelloy C-276 Standards |
|---|---|---|
| Seamless Pipe & Tube | ASTM B444, ASTM B829 | ASTM B622, ASTM B983 |
| Welded Pipe | ASTM B705, ASTM B775 | ASTM B619 |
| Welded Tube | ASTM B704, ASTM B751 | ASTM B626 |
| Fittings | ASTM B366 (Welded) | ASTM B366 + ASTM B462 |
| Rod/Bar | ASTM B446 (Rod & Bar) | ASTM B574 (Billet, Rod & Bar) |
| Forgings | ASTM B564 | ASTM B564 + ASTM B462 |
| Plate/Sheet/Strip | ASTM B443 | ASTM B575 |
Conclusion
Both Inconel 625 and Hastelloy C-276 have good corrosion resistance. Inconel 625 is more suitable for oxidizing environments, while Hastelloy C-276 is more suitable for reducing environments.
Both alloys are solid solution strengthened alloys. Although the elements that play the role of solid solution strengthening are different, overall, the mechanical properties of the two are not much different.
The application range of both alloys is similar, but they play different roles in the same application.
Gnee Steel can produce Inconel 625 and Hastelloy C-276 alloy products according to your needs. If you have any purchasing needs, please feel free to contact us: ss@gneesteel.com
